By default, I don't think so, it makes a new profile on each use. My intent is to re-use the profile, by placing options.add_argument=('--user-data-dir=/some/directory') into the Flaresolverr-3.3.17/src/utils.py (where it sets the other options using options.add_argument). This does mean you could only run one copy of Chrome at a time (multiple copies of Chrome cannot share a user profile.)

For my use, I had cookies working for the site I was using; I have an account on there, but login is via Telegram. Then they used cloudflare (the person I wrote this for, they did tell the site owner they are running this bot and they're fine with it... it's very polite and only does a hit every 15 seconds in some points and a hit every 60 seconds at others. The put on Cloudflare for the CDN not the anti-bot functionality.) So I updated to use flaresolverr, cookies continued to work fine. They've changed something more recently (I think on Telegram's end most likely) and using the cookies (from a currently logged in browser) no longer works. So, my plan is to physically log in the browser, make flaresolverr re-use that session, and comment out the cookie-handling code (that will then be redundant) from my program.

But, I imagine this would also work to be able to add one or more extensions to the profile, and have flaresolverr continue to use that profile with the extensions.

Good luck!
--Henry